An Observational Study of Infliximab Injection in Ankylosing Spondylitis, Rheumatoid Arthritis, Psoriatic Arthritis and Psoriasis Participants

This is an observational study. Participants with RA, AS and PA receiving induction intravenous infusions (a fluid or a medicine delivered into a vein by way of a needle) of infliximab will be observed. Participants with RA will receive infliximab 3 milligram per kilogram (mg/kg) as an intravenous infusion over a 2-hour period followed by additional 3 mg/kg infusion doses at 2 and 6 weeks after the first infusion, then every 8 weeks (maintenance) thereafter up to 30 weeks. Participants with AS and PA will receive 5 mg/kg infliximab as an intravenous infusion over 2-hour period followed by additional doses at 2 and 6 weeks up to 24-30 weeks and 30 weeks, respectively.

Participants with RA will receive methotrexate based on physician's clinical judgement.